Aamna BALOUCH, Muhammad Iqbal BHANGER, Farah Naz TALPUR

Determination of Ni(II) with picolinaldehyde-4-phenyl-3-thiosemicarbazone used as a chromogenic reagent in a nonionic micellar system

Spectrophotometric determination of Ni(II) was carried out using picolinaldehyde-4-phenyl-3-thiosemicarbazone (PAPT) as a complexing/chromogenic reagent. The possibility of using a micellar system was explored to enhance the degree of detection and allow a more sensitive spectrophotometric method for the determination of nickel ions. The anionic surfactant Triton X-100 greatly enhanced the molar absorptivity and limit of detection relative to that observed with bulk water or an organic solvent. The linear calibration graphs were obtained for 0.5-2.0 mg L-1 and 0.001-1.0 mg L-1 of Ni(II) in aqueous and surfactant media, respectively. Using this approach, the limit of detection for the PAPT-Ni(II) complex (based on 3 s of blank absorbance/slope) was found to be 0.0008 mg L-1 with a micellar enhancement reagent. The interference from over 50 cations, anions, and complexing agents was studied at 0.50 mg L-1 of Ni(II); most metal ions can be tolerated in considerable amounts in aqueous micellar solutions.

Anahtar Kelimeler:

Spectrophotometry, surfactant, Ni(II), PAPT

Determination of Ni(II) with picolinaldehyde-4-phenyl-3-thiosemicarbazone used as a chromogenic reagent in a nonionic micellar system

Keywords:

Spectrophotometry, surfactant, Ni(II), PAPT,

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solution not only serves to remove the need for organic solvents but also enhances the analytical signal and
consequently the sensitivity of method. With the use of a micellar system, less of the PAPT chelating reagent is
required. The method is applicable to complex matrices and serves as a single-step, quick method that requires
no clean-up process for interfering ions.
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